Relay switch



Jan. l5, 1935. EV MI ASHWORTH ET AL 1,987,887

RELAY SWITCH Filed Jan. l2, 1933 @ign NM a, M@ @www p ns m. zwmw 2 w m 7W, ff., m @MHC 4./ m m m f f, u m m m m n m m m m m ra -,ziL I. L 5 0 2 5 Patented Jan. 15, 1935 o-FFlcE RELAY Edward M. Ashworth,

SWITCH Frank F. Ambuhl, and

Henry W. Smith, Toronto, Ontario, Canada, assignors to Toronto Electric Commissioners,

Toronto, Ontario, Canada Application January 12, 1933, Serial No. 651,346

1 Claim.

The principal objects of this invention are to devise a very simple and positive form of relay, particularly applicable for a control system, which will automatically assume a. neutral position when the circuits controlling its operation are open.

A further and important feature is to provide a relay which will be reliable in its operation and which will directly control the switching elements in electric circuits eliminating the necessity for the use of auxiliary relays.

'I'he principal feature of the invention consists in the novel arrangement of balancing tension springs connected with the armature of an electro-magnetic oscillating relay to hold it in a `leutral position with the switch element mounted thereon clear of the circuit contacts controlled thereby, said armature being operable to swing in either direction from the neutral position to move the switch element to engage the contacts to close either of the controlled circuits.

In the accompanying drawing Figure 1 is a front elevation of the relay, parts thereof being broken away.

Figure 2 is a side elevational view.

In the construction herein shown, a, laminated core 1 is formed with a pair of parallel uprights 2 and 3 and a central upright member 4 spaced centrally therebetween, the central member being shorter than the others and having an arc-shaped end surface. This core is mounted upon a plurality of studs 5 which are rigid with the mounting plate 6.

Electro-magnetic coils 7 and 8 are wound upon the members 2 and 3 respectively and these are connected in a suitably controlled circuit to direct a current through either one or the other as may be desired.

A pair of parallelly arranged bars 9 are se- 40 cured to and extend between the upper ends of the side cores 2 and 3 and a spindle 10 is horizontally journalled in said bars centrally of the length thereof.

An oscillating amature 11 is rigidly mounted upon the spindle having the ends of the horizontal portion thereof extending into close proximity to the arc-shaped surfaces of the magnet cores 2 and 3, and a central downwardly depending leg 12 of said armature extends into close relationship to the arc-shaped end surface of the centre core member 4.

A pair of brackets 13 which are formed rigid with the mounting plate 6 extend past the ends of the laminated core and support a horizontal plate 14. A pair ofblocks 15 and 16 of insulat- (Cl. 20o-87) ing material are mounted on the plate 14 equidistant from the centre thereof and on each of said blocks are mounted a pair of spring contacts 17 and 18 which are connected with suitable leads 19 to binding screws 20 on the mounting plate.

A bar 21 is rigidly mounted on the end of the spindle 10 projecting over the plate 14 and coiled tension springs 22 and 23 are secured to the ends thereof and extending downwardly are connected to the plate 14 by the adjustable rods 24 and 25 respectively.

A tongue 26 extends downwardly from the centre of the bar 21 and has mounted on the end thereof a transverse bar 27 to which are secured the insulated contact plates 28 and 29 which upon the swinging of the bar 21 engage and close the contacts 17 or 18.

It will be understood that when a current is directed through the coil 7 a magnetic flux is established through the core 2, armature 11 and centre core 4 which will swing the armature on its pivot against the tension of the spring 23 thereby swinging the contact plate 29 into engagement with the exible contacts 18, and thereby closing an electric circuit which may be for operating a circuit breaker or other device.

When a current is directed through the coil 8 a similar magnetic ux is established through the core 3, armature 11 and centre core 4 which has the effect of swinging the armature against the tension of the spring 22 and closing the circuit connected with the contacts 17.

'I'he entire structure is enclosed by a cover 30 which is clamped against the plate 6 by nuts 31 threaded on studs 32 extending from the brackets 13. The cover is preferably provided with a small opening 33 in its front side giving access to the switch contacts and is closed by a door 34.

'I'he switch circuit will be retained closed so long as the current through the controlling magnet coil is sustained, but immediately upon the opening of the magnet coil circuits, the spring 22 or 23 whichever is in tension will swing the armature back to a neutral position where it is held by the balancing springs 22 and 23 `out of contact with the contacts 17 and 18.

A device such as described is extremely simple in operation; is very rugged in structure and will remain in operation without attention for an indefinite period of time, functioning positively upon the closing of an electric circuit through either one of its magnetic coils.

What We claim as our invention isz- A relay switch comprising in combination a magnet core having a central pole member and spaced pole members, magnet windings on said spaced pole members, said central and spaced pole members having their ends disposed in a path substantially Yconcentric gaA /J-rr1,1r n centre, an armature mounted to'escillate-l-orrjsaid common centre and 'having' triple pole ends swinging into close non-contacting relation tg i said pole ends, switch means selectively operated f by said armature and acting to limit thevgigg-n, g, 

